[GitHub/mt8127/android_kernel_alcatel_ttab.git] / fs / ecryptfs / file.c

/**
 * eCryptfs: Linux filesystem encryption layer
 *
 * Copyright (C) 1997-2004 Erez Zadok
 * Copyright (C) 2001-2004 Stony Brook University
 * Copyright (C) 2004-2007 International Business Machines Corp.
 *   Author(s): Michael A. Halcrow <mhalcrow@us.ibm.com>
 *   		Michael C. Thompson <mcthomps@us.ibm.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
 * 02111-1307, USA.
 */

#include <linux/file.h>
#include <linux/poll.h>
#include <linux/mount.h>
#include <linux/pagemap.h>
#include <linux/security.h>
#include <linux/compat.h>
#include <linux/fs_stack.h>
#include <linux/smp_lock.h>
#include "ecryptfs_kernel.h"

/**
 * ecryptfs_read_update_atime
 *
 * generic_file_read updates the atime of upper layer inode.  But, it
 * doesn't give us a chance to update the atime of the lower layer
 * inode.  This function is a wrapper to generic_file_read.  It
 * updates the atime of the lower level inode if generic_file_read
 * returns without any errors. This is to be used only for file reads.
 * The function to be used for directory reads is ecryptfs_read.
 */
static ssize_t ecryptfs_read_update_atime(struct kiocb *iocb,
				const struct iovec *iov,
				unsigned long nr_segs, loff_t pos)
{
	int rc;
	struct dentry *lower_dentry;
	struct vfsmount *lower_vfsmount;
	struct file *file = iocb->ki_filp;

	rc = generic_file_aio_read(iocb, iov, nr_segs, pos);
	/*
	 * Even though this is a async interface, we need to wait
	 * for IO to finish to update atime
	 */
	if (-EIOCBQUEUED == rc)
		rc = wait_on_sync_kiocb(iocb);
	if (rc >= 0) {
		lower_dentry = ecryptfs_dentry_to_lower(file->f_path.dentry);
		lower_vfsmount = ecryptfs_dentry_to_lower_mnt(file->f_path.dentry);
		touch_atime(lower_vfsmount, lower_dentry);
	}
	return rc;
}

struct ecryptfs_getdents_callback {
	void *dirent;
	struct dentry *dentry;
	filldir_t filldir;
	int err;
	int filldir_called;
	int entries_written;
};

/* Inspired by generic filldir in fs/readir.c */
static int
ecryptfs_filldir(void *dirent, const char *name, int namelen, loff_t offset,
		 u64 ino, unsigned int d_type)
{
	struct ecryptfs_crypt_stat *crypt_stat;
	struct ecryptfs_getdents_callback *buf =
	    (struct ecryptfs_getdents_callback *)dirent;
	int rc;
	int decoded_length;
	char *decoded_name;

	crypt_stat = ecryptfs_dentry_to_private(buf->dentry)->crypt_stat;
	buf->filldir_called++;
	decoded_length = ecryptfs_decode_filename(crypt_stat, name, namelen,
						  &decoded_name);
	if (decoded_length < 0) {
		rc = decoded_length;
		goto out;
	}
	rc = buf->filldir(buf->dirent, decoded_name, decoded_length, offset,
			  ino, d_type);
	kfree(decoded_name);
	if (rc >= 0)
		buf->entries_written++;
out:
	return rc;
}

/**
 * ecryptfs_readdir
 * @file: The ecryptfs file struct
 * @dirent: Directory entry
 * @filldir: The filldir callback function
 */
static int ecryptfs_readdir(struct file *file, void *dirent, filldir_t filldir)
{
	int rc;
	struct file *lower_file;
	struct inode *inode;
	struct ecryptfs_getdents_callback buf;

	lower_file = ecryptfs_file_to_lower(file);
	lower_file->f_pos = file->f_pos;
	inode = file->f_path.dentry->d_inode;
	memset(&buf, 0, sizeof(buf));
	buf.dirent = dirent;
	buf.dentry = file->f_path.dentry;
	buf.filldir = filldir;
retry:
	buf.filldir_called = 0;
	buf.entries_written = 0;
	buf.err = 0;
	rc = vfs_readdir(lower_file, ecryptfs_filldir, (void *)&buf);
	if (buf.err)
		rc = buf.err;
	if (buf.filldir_called && !buf.entries_written)
		goto retry;
	file->f_pos = lower_file->f_pos;
	if (rc >= 0)
		fsstack_copy_attr_atime(inode, lower_file->f_path.dentry->d_inode);
	return rc;
}

struct kmem_cache *ecryptfs_file_info_cache;

/**
 * ecryptfs_open
 * @inode: inode speciying file to open
 * @file: Structure to return filled in
 *
 * Opens the file specified by inode.
 *
 * Returns zero on success; non-zero otherwise
 */
static int ecryptfs_open(struct inode *inode, struct file *file)
{
	int rc = 0;
	struct ecryptfs_crypt_stat *crypt_stat = NULL;
	struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
	struct dentry *ecryptfs_dentry = file->f_path.dentry;
	/* Private value of ecryptfs_dentry allocated in
	 * ecryptfs_lookup() */
	struct dentry *lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry);
	struct ecryptfs_file_info *file_info;

	mount_crypt_stat = &ecryptfs_superblock_to_private(
		ecryptfs_dentry->d_sb)->mount_crypt_stat;
	if ((mount_crypt_stat->flags & ECRYPTFS_ENCRYPTED_VIEW_ENABLED)
	    && ((file->f_flags & O_WRONLY) || (file->f_flags & O_RDWR)
		|| (file->f_flags & O_CREAT) || (file->f_flags & O_TRUNC)
		|| (file->f_flags & O_APPEND))) {
		printk(KERN_WARNING "Mount has encrypted view enabled; "
		       "files may only be read\n");
		rc = -EPERM;
		goto out;
	}
	/* Released in ecryptfs_release or end of function if failure */
	file_info = kmem_cache_zalloc(ecryptfs_file_info_cache, GFP_KERNEL);
	ecryptfs_set_file_private(file, file_info);
	if (!file_info) {
		ecryptfs_printk(KERN_ERR,
				"Error attempting to allocate memory\n");
		rc = -ENOMEM;
		goto out;
	}
	lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry);
	crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat;
	mutex_lock(&crypt_stat->cs_mutex);
	if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)) {
		ecryptfs_printk(KERN_DEBUG, "Setting flags for stat...\n");
		/* Policy code enabled in future release */
		crypt_stat->flags |= (ECRYPTFS_POLICY_APPLIED
				      | ECRYPTFS_ENCRYPTED);
	}
	mutex_unlock(&crypt_stat->cs_mutex);
	if ((ecryptfs_inode_to_private(inode)->lower_file->f_flags & O_RDONLY)
	    && !(file->f_flags & O_RDONLY)) {
		rc = -EPERM;
		printk(KERN_WARNING "%s: Lower persistent file is RO; eCryptfs "
		       "file must hence be opened RO\n", __func__);
		goto out;
	}
	ecryptfs_set_file_lower(
		file, ecryptfs_inode_to_private(inode)->lower_file);
	if (S_ISDIR(ecryptfs_dentry->d_inode->i_mode)) {
		ecryptfs_printk(KERN_DEBUG, "This is a directory\n");
		mutex_lock(&crypt_stat->cs_mutex);
		crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
		mutex_unlock(&crypt_stat->cs_mutex);
		rc = 0;
		goto out;
	}
	mutex_lock(&crypt_stat->cs_mutex);
	if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)
	    || !(crypt_stat->flags & ECRYPTFS_KEY_VALID)) {
		rc = ecryptfs_read_metadata(ecryptfs_dentry);
		if (rc) {
			ecryptfs_printk(KERN_DEBUG,
					"Valid headers not found\n");
			if (!(mount_crypt_stat->flags
			      & ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) {
				rc = -EIO;
				printk(KERN_WARNING "Either the lower file "
				       "is not in a valid eCryptfs format, "
				       "or the key could not be retrieved. "
				       "Plaintext passthrough mode is not "
				       "enabled; returning -EIO\n");
				mutex_unlock(&crypt_stat->cs_mutex);
				goto out_free;
			}
			rc = 0;
			crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
			mutex_unlock(&crypt_stat->cs_mutex);
			goto out;
		}
	}
	mutex_unlock(&crypt_stat->cs_mutex);
	ecryptfs_printk(KERN_DEBUG, "inode w/ addr = [0x%p], i_ino = [0x%.16x] "
			"size: [0x%.16x]\n", inode, inode->i_ino,
			i_size_read(inode));
	goto out;
out_free:
	kmem_cache_free(ecryptfs_file_info_cache,
			ecryptfs_file_to_private(file));
out:
	return rc;
}

static int ecryptfs_flush(struct file *file, fl_owner_t td)
{
	int rc = 0;
	struct file *lower_file = NULL;

	lower_file = ecryptfs_file_to_lower(file);
	if (lower_file->f_op && lower_file->f_op->flush)
		rc = lower_file->f_op->flush(lower_file, td);
	return rc;
}

static int ecryptfs_release(struct inode *inode, struct file *file)
{
	kmem_cache_free(ecryptfs_file_info_cache,
			ecryptfs_file_to_private(file));
	return 0;
}

static int
ecryptfs_fsync(struct file *file, struct dentry *dentry, int datasync)
{
	struct file *lower_file = ecryptfs_file_to_lower(file);
	struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
	struct inode *lower_inode = lower_dentry->d_inode;
	int rc = -EINVAL;

	if (lower_inode->i_fop->fsync) {
		mutex_lock(&lower_inode->i_mutex);
		rc = lower_inode->i_fop->fsync(lower_file, lower_dentry,
					       datasync);
		mutex_unlock(&lower_inode->i_mutex);
	}
	return rc;
}

static int ecryptfs_fasync(int fd, struct file *file, int flag)
{
	int rc = 0;
	struct file *lower_file = NULL;

	lock_kernel();
	lower_file = ecryptfs_file_to_lower(file);
	if (lower_file->f_op && lower_file->f_op->fasync)
		rc = lower_file->f_op->fasync(fd, lower_file, flag);
	unlock_kernel();
	return rc;
}

static int ecryptfs_ioctl(struct inode *inode, struct file *file,
			  unsigned int cmd, unsigned long arg);

const struct file_operations ecryptfs_dir_fops = {
	.readdir = ecryptfs_readdir,
	.ioctl = ecryptfs_ioctl,
	.mmap = generic_file_mmap,
	.open = ecryptfs_open,
	.flush = ecryptfs_flush,
	.release = ecryptfs_release,
	.fsync = ecryptfs_fsync,
	.fasync = ecryptfs_fasync,
	.splice_read = generic_file_splice_read,
};

const struct file_operations ecryptfs_main_fops = {
	.llseek = generic_file_llseek,
	.read = do_sync_read,
	.aio_read = ecryptfs_read_update_atime,
	.write = do_sync_write,
	.aio_write = generic_file_aio_write,
	.readdir = ecryptfs_readdir,
	.ioctl = ecryptfs_ioctl,
	.mmap = generic_file_mmap,
	.open = ecryptfs_open,
	.flush = ecryptfs_flush,
	.release = ecryptfs_release,
	.fsync = ecryptfs_fsync,
	.fasync = ecryptfs_fasync,
	.splice_read = generic_file_splice_read,
};

static int
ecryptfs_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
	       unsigned long arg)
{
	int rc = 0;
	struct file *lower_file = NULL;

	if (ecryptfs_file_to_private(file))
		lower_file = ecryptfs_file_to_lower(file);
	if (lower_file && lower_file->f_op && lower_file->f_op->ioctl)
		rc = lower_file->f_op->ioctl(ecryptfs_inode_to_lower(inode),
					     lower_file, cmd, arg);
	else
		rc = -ENOTTY;
	return rc;
}
Commit	Line	Data
237fead6 MH	1	/**
	2	* eCryptfs: Linux filesystem encryption layer
	3	*
	4	* Copyright (C) 1997-2004 Erez Zadok
	5	* Copyright (C) 2001-2004 Stony Brook University
dd2a3b7a	6	* Copyright (C) 2004-2007 International Business Machines Corp.
237fead6 MH	7	* Author(s): Michael A. Halcrow <mhalcrow@us.ibm.com>
	8	* Michael C. Thompson <mcthomps@us.ibm.com>
	9	*
	10	* This program is free software; you can redistribute it and/or
	11	* modify it under the terms of the GNU General Public License as
	12	* published by the Free Software Foundation; either version 2 of the
	13	* License, or (at your option) any later version.
	14	*
	15	* This program is distributed in the hope that it will be useful, but
	16	* WITHOUT ANY WARRANTY; without even the implied warranty of
	17	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	18	* General Public License for more details.
	19	*
	20	* You should have received a copy of the GNU General Public License
	21	* along with this program; if not, write to the Free Software
	22	* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
	23	* 02111-1307, USA.
	24	*/
	25
	26	#include <linux/file.h>
	27	#include <linux/poll.h>
	28	#include <linux/mount.h>
	29	#include <linux/pagemap.h>
	30	#include <linux/security.h>
237fead6	31	#include <linux/compat.h>
0cc72dc7	32	#include <linux/fs_stack.h>
dda6445e	33	#include <linux/smp_lock.h>
237fead6 MH	34	#include "ecryptfs_kernel.h"
237fead6 MH	35
237fead6 MH	36	/**
	37	* ecryptfs_read_update_atime
	38	*
	39	* generic_file_read updates the atime of upper layer inode. But, it
	40	* doesn't give us a chance to update the atime of the lower layer
	41	* inode. This function is a wrapper to generic_file_read. It
	42	* updates the atime of the lower level inode if generic_file_read
	43	* returns without any errors. This is to be used only for file reads.
	44	* The function to be used for directory reads is ecryptfs_read.
	45	*/
	46	static ssize_t ecryptfs_read_update_atime(struct kiocb *iocb,
	47	const struct iovec *iov,
	48	unsigned long nr_segs, loff_t pos)
	49	{
	50	int rc;
	51	struct dentry *lower_dentry;
	52	struct vfsmount *lower_vfsmount;
	53	struct file *file = iocb->ki_filp;
	54
	55	rc = generic_file_aio_read(iocb, iov, nr_segs, pos);
	56	/*
	57	* Even though this is a async interface, we need to wait
	58	* for IO to finish to update atime
	59	*/
	60	if (-EIOCBQUEUED == rc)
	61	rc = wait_on_sync_kiocb(iocb);
	62	if (rc >= 0) {
bd243a4b JJS	63	lower_dentry = ecryptfs_dentry_to_lower(file->f_path.dentry);
bd243a4b JJS	64	lower_vfsmount = ecryptfs_dentry_to_lower_mnt(file->f_path.dentry);
237fead6 MH	65	touch_atime(lower_vfsmount, lower_dentry);
	66	}
	67	return rc;
	68	}
	69
	70	struct ecryptfs_getdents_callback {
	71	void *dirent;
	72	struct dentry *dentry;
	73	filldir_t filldir;
	74	int err;
	75	int filldir_called;
	76	int entries_written;
	77	};
	78
	79	/* Inspired by generic filldir in fs/readir.c */
	80	static int
	81	ecryptfs_filldir(void dirent, const char name, int namelen, loff_t offset,
	82	u64 ino, unsigned int d_type)
	83	{
	84	struct ecryptfs_crypt_stat *crypt_stat;
	85	struct ecryptfs_getdents_callback *buf =
	86	(struct ecryptfs_getdents_callback *)dirent;
	87	int rc;
	88	int decoded_length;
	89	char *decoded_name;
	90
	91	crypt_stat = ecryptfs_dentry_to_private(buf->dentry)->crypt_stat;
	92	buf->filldir_called++;
	93	decoded_length = ecryptfs_decode_filename(crypt_stat, name, namelen,
	94	&decoded_name);
	95	if (decoded_length < 0) {
	96	rc = decoded_length;
	97	goto out;
	98	}
	99	rc = buf->filldir(buf->dirent, decoded_name, decoded_length, offset,
	100	ino, d_type);
	101	kfree(decoded_name);
	102	if (rc >= 0)
	103	buf->entries_written++;
	104	out:
	105	return rc;
	106	}
	107
	108	/**
	109	* ecryptfs_readdir
	110	* @file: The ecryptfs file struct
	111	* @dirent: Directory entry
	112	* @filldir: The filldir callback function
	113	*/
	114	static int ecryptfs_readdir(struct file file, void dirent, filldir_t filldir)
	115	{
	116	int rc;
	117	struct file *lower_file;
	118	struct inode *inode;
	119	struct ecryptfs_getdents_callback buf;
	120
	121	lower_file = ecryptfs_file_to_lower(file);
	122	lower_file->f_pos = file->f_pos;
bd243a4b	123	inode = file->f_path.dentry->d_inode;
237fead6 MH	124	memset(&buf, 0, sizeof(buf));
237fead6 MH	125	buf.dirent = dirent;
bd243a4b	126	buf.dentry = file->f_path.dentry;
237fead6 MH	127	buf.filldir = filldir;
	128	retry:
	129	buf.filldir_called = 0;
	130	buf.entries_written = 0;
	131	buf.err = 0;
	132	rc = vfs_readdir(lower_file, ecryptfs_filldir, (void *)&buf);
	133	if (buf.err)
	134	rc = buf.err;
	135	if (buf.filldir_called && !buf.entries_written)
	136	goto retry;
	137	file->f_pos = lower_file->f_pos;
	138	if (rc >= 0)
bd243a4b	139	fsstack_copy_attr_atime(inode, lower_file->f_path.dentry->d_inode);
237fead6 MH	140	return rc;
	141	}
	142
	143	struct kmem_cache *ecryptfs_file_info_cache;
	144
	145	/**
	146	* ecryptfs_open
	147	* @inode: inode speciying file to open
	148	* @file: Structure to return filled in
	149	*
	150	* Opens the file specified by inode.
	151	*
	152	* Returns zero on success; non-zero otherwise
	153	*/
	154	static int ecryptfs_open(struct inode inode, struct file file)
	155	{
	156	int rc = 0;
	157	struct ecryptfs_crypt_stat *crypt_stat = NULL;
	158	struct ecryptfs_mount_crypt_stat *mount_crypt_stat;
bd243a4b	159	struct dentry *ecryptfs_dentry = file->f_path.dentry;
237fead6 MH	160	/* Private value of ecryptfs_dentry allocated in
	161	* ecryptfs_lookup() */
	162	struct dentry *lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry);
237fead6	163	struct ecryptfs_file_info *file_info;
237fead6	164
e77a56dd MH	165	mount_crypt_stat = &ecryptfs_superblock_to_private(
	166	ecryptfs_dentry->d_sb)->mount_crypt_stat;
	167	if ((mount_crypt_stat->flags & ECRYPTFS_ENCRYPTED_VIEW_ENABLED)
	168	&& ((file->f_flags & O_WRONLY) \|\| (file->f_flags & O_RDWR)
	169	\|\| (file->f_flags & O_CREAT) \|\| (file->f_flags & O_TRUNC)
	170	\|\| (file->f_flags & O_APPEND))) {
	171	printk(KERN_WARNING "Mount has encrypted view enabled; "
	172	"files may only be read\n");
	173	rc = -EPERM;
	174	goto out;
	175	}
237fead6	176	/* Released in ecryptfs_release or end of function if failure */
c3762229	177	file_info = kmem_cache_zalloc(ecryptfs_file_info_cache, GFP_KERNEL);
237fead6 MH	178	ecryptfs_set_file_private(file, file_info);
	179	if (!file_info) {
	180	ecryptfs_printk(KERN_ERR,
	181	"Error attempting to allocate memory\n");
	182	rc = -ENOMEM;
	183	goto out;
	184	}
237fead6 MH	185	lower_dentry = ecryptfs_dentry_to_lower(ecryptfs_dentry);
237fead6 MH	186	crypt_stat = &ecryptfs_inode_to_private(inode)->crypt_stat;
237fead6	187	mutex_lock(&crypt_stat->cs_mutex);
e2bd99ec	188	if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)) {
237fead6 MH	189	ecryptfs_printk(KERN_DEBUG, "Setting flags for stat...\n");
237fead6 MH	190	/* Policy code enabled in future release */
2ed92554 MH	191	crypt_stat->flags \|= (ECRYPTFS_POLICY_APPLIED
2ed92554 MH	192	\| ECRYPTFS_ENCRYPTED);
237fead6 MH	193	}
237fead6 MH	194	mutex_unlock(&crypt_stat->cs_mutex);
746f1e55 MH	195	if ((ecryptfs_inode_to_private(inode)->lower_file->f_flags & O_RDONLY)
	196	&& !(file->f_flags & O_RDONLY)) {
	197	rc = -EPERM;
	198	printk(KERN_WARNING "%s: Lower persistent file is RO; eCryptfs "
	199	"file must hence be opened RO\n", __func__);
	200	goto out;
	201	}
2ed92554 MH	202	ecryptfs_set_file_lower(
2ed92554 MH	203	file, ecryptfs_inode_to_private(inode)->lower_file);
237fead6 MH	204	if (S_ISDIR(ecryptfs_dentry->d_inode->i_mode)) {
237fead6 MH	205	ecryptfs_printk(KERN_DEBUG, "This is a directory\n");
2f9b12a3	206	mutex_lock(&crypt_stat->cs_mutex);
e2bd99ec	207	crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
2f9b12a3	208	mutex_unlock(&crypt_stat->cs_mutex);
237fead6 MH	209	rc = 0;
	210	goto out;
	211	}
	212	mutex_lock(&crypt_stat->cs_mutex);
e2bd99ec MH	213	if (!(crypt_stat->flags & ECRYPTFS_POLICY_APPLIED)
e2bd99ec MH	214	\|\| !(crypt_stat->flags & ECRYPTFS_KEY_VALID)) {
d7cdc5fe	215	rc = ecryptfs_read_metadata(ecryptfs_dentry);
237fead6 MH	216	if (rc) {
	217	ecryptfs_printk(KERN_DEBUG,
	218	"Valid headers not found\n");
	219	if (!(mount_crypt_stat->flags
	220	& ECRYPTFS_PLAINTEXT_PASSTHROUGH_ENABLED)) {
	221	rc = -EIO;
25bd8174	222	printk(KERN_WARNING "Either the lower file "
237fead6	223	"is not in a valid eCryptfs format, "
25bd8174 MH	224	"or the key could not be retrieved. "
25bd8174 MH	225	"Plaintext passthrough mode is not "
237fead6 MH	226	"enabled; returning -EIO\n");
237fead6 MH	227	mutex_unlock(&crypt_stat->cs_mutex);
2ed92554	228	goto out_free;
237fead6	229	}
237fead6	230	rc = 0;
e2bd99ec	231	crypt_stat->flags &= ~(ECRYPTFS_ENCRYPTED);
237fead6 MH	232	mutex_unlock(&crypt_stat->cs_mutex);
	233	goto out;
	234	}
	235	}
	236	mutex_unlock(&crypt_stat->cs_mutex);
	237	ecryptfs_printk(KERN_DEBUG, "inode w/ addr = [0x%p], i_ino = [0x%.16x] "
	238	"size: [0x%.16x]\n", inode, inode->i_ino,
	239	i_size_read(inode));
237fead6	240	goto out;
2ed92554	241	out_free:
237fead6 MH	242	kmem_cache_free(ecryptfs_file_info_cache,
	243	ecryptfs_file_to_private(file));
	244	out:
	245	return rc;
	246	}
	247
	248	static int ecryptfs_flush(struct file *file, fl_owner_t td)
	249	{
	250	int rc = 0;
	251	struct file *lower_file = NULL;
	252
	253	lower_file = ecryptfs_file_to_lower(file);
	254	if (lower_file->f_op && lower_file->f_op->flush)
	255	rc = lower_file->f_op->flush(lower_file, td);
	256	return rc;
	257	}
	258
	259	static int ecryptfs_release(struct inode inode, struct file file)
	260	{
2ed92554 MH	261	kmem_cache_free(ecryptfs_file_info_cache,
	262	ecryptfs_file_to_private(file));
	263	return 0;
237fead6 MH	264	}
	265
	266	static int
	267	ecryptfs_fsync(struct file file, struct dentry dentry, int datasync)
	268	{
	269	struct file *lower_file = ecryptfs_file_to_lower(file);
	270	struct dentry *lower_dentry = ecryptfs_dentry_to_lower(dentry);
	271	struct inode *lower_inode = lower_dentry->d_inode;
	272	int rc = -EINVAL;
	273
	274	if (lower_inode->i_fop->fsync) {
	275	mutex_lock(&lower_inode->i_mutex);
	276	rc = lower_inode->i_fop->fsync(lower_file, lower_dentry,
	277	datasync);
	278	mutex_unlock(&lower_inode->i_mutex);
	279	}
	280	return rc;
	281	}
	282
	283	static int ecryptfs_fasync(int fd, struct file *file, int flag)
	284	{
	285	int rc = 0;
	286	struct file *lower_file = NULL;
	287
dda6445e	288	lock_kernel();
237fead6 MH	289	lower_file = ecryptfs_file_to_lower(file);
	290	if (lower_file->f_op && lower_file->f_op->fasync)
	291	rc = lower_file->f_op->fasync(fd, lower_file, flag);
dda6445e	292	unlock_kernel();
237fead6 MH	293	return rc;
	294	}
	295
237fead6 MH	296	static int ecryptfs_ioctl(struct inode inode, struct file file,
	297	unsigned int cmd, unsigned long arg);
	298
	299	const struct file_operations ecryptfs_dir_fops = {
	300	.readdir = ecryptfs_readdir,
	301	.ioctl = ecryptfs_ioctl,
	302	.mmap = generic_file_mmap,
	303	.open = ecryptfs_open,
	304	.flush = ecryptfs_flush,
	305	.release = ecryptfs_release,
	306	.fsync = ecryptfs_fsync,
	307	.fasync = ecryptfs_fasync,
e9f6a99c	308	.splice_read = generic_file_splice_read,
237fead6 MH	309	};
	310
	311	const struct file_operations ecryptfs_main_fops = {
53a2731f	312	.llseek = generic_file_llseek,
237fead6 MH	313	.read = do_sync_read,
	314	.aio_read = ecryptfs_read_update_atime,
	315	.write = do_sync_write,
	316	.aio_write = generic_file_aio_write,
	317	.readdir = ecryptfs_readdir,
	318	.ioctl = ecryptfs_ioctl,
	319	.mmap = generic_file_mmap,
	320	.open = ecryptfs_open,
	321	.flush = ecryptfs_flush,
	322	.release = ecryptfs_release,
	323	.fsync = ecryptfs_fsync,
	324	.fasync = ecryptfs_fasync,
e9f6a99c	325	.splice_read = generic_file_splice_read,
237fead6 MH	326	};
	327
	328	static int
	329	ecryptfs_ioctl(struct inode inode, struct file file, unsigned int cmd,
	330	unsigned long arg)
	331	{
	332	int rc = 0;
	333	struct file *lower_file = NULL;
	334
	335	if (ecryptfs_file_to_private(file))
	336	lower_file = ecryptfs_file_to_lower(file);
	337	if (lower_file && lower_file->f_op && lower_file->f_op->ioctl)
	338	rc = lower_file->f_op->ioctl(ecryptfs_inode_to_lower(inode),
	339	lower_file, cmd, arg);
	340	else
	341	rc = -ENOTTY;
	342	return rc;
	343	}